feat: support custom config for preset-env

[njugray]

Solved the warning:

WARNING: We noticed you're using the `useBuiltIns` option without declaring a core-js version. Currently, we assume version 2.x when no version is passed. Since this default version will likely change in future versions of Babel, we recommend explicitly setting the core-js version you are using via the `corejs` option.

You should also be sure that the version you pass to the `corejs` option matches the version specified in your `package.json`'s `dependencies` section. If it doesn't, you need to run one of the following commands:

  npm install --save core-js@2    npm install --save core-js@3
  yarn add core-js@2              yarn add core-js@3

Checklist

• npm test passes
• tests are included
• documentation is changed or added
• commit message follows commit guidelines

Affected plugin(s)

• babel-preset-beidou-client

Description of change

for preset-env:

• set corejs default to 3.0.0
• support custom config

[codecov-io]

Codecov Report

Merging #169 into master will increase coverage by 0.07%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #169      +/-   ##
==========================================
+ Coverage   92.77%   92.84%   +0.07%     
==========================================
  Files          87       87              
  Lines        1605     1607       +2     
==========================================
+ Hits         1489     1492       +3     
+ Misses        116      115       -1

Impacted Files	Coverage Δ
packages/babel-preset-beidou-client/index.js	100% <100%> (ø)	⬆️
packages/beidou-view-rax/lib/rax-view.js	100% <0%> (+5.88%)	⬆️

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[ahungrynoob]

typo: @babel/reset-react in readme ^ ^